convert the type of value of 'app:fileUpload' to boolean

lib/form/admin/app.js

@@ -6,6 +6,6 @@ var form = require('express-form')
 module.exports = form(
   field('settingForm[app:title]').required(),
   field('settingForm[app:confidential]'),
-  field('settingForm[app:fileUpload]').isInt()
+  field('settingForm[app:fileUpload]').trim().toBooleanStrict()
 );
 

lib/models/config.js

@@ -28,6 +28,7 @@ module.exports = function(crowi) {
 
     // overwrite
     config['app:title'] = 'crowi-plus';
+    config['app:fileUpload'] = true;
     config['security:isEnabledPassport'] = true;
     config['customize:behavior'] = 'crowi-plus';
     config['customize:layout'] = 'crowi-plus';
@@ -382,7 +383,8 @@ module.exports = function(crowi) {
       return false;
     }
 
-    return config.crowi['app:fileUpload'] || false;
+    // convert to boolean
+    return !!config.crowi['app:fileUpload'];
   };
 
   configSchema.statics.hasSlackConfig = function(config)